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Tranggono .
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A Kinetic Study of Xylitol Production with Glucose and Arabinose as Cosubstrate by Candida shehatae WAY 08 Wisnu Adi Yulianto; Kapti Rahayu Kuswanto; Tranggono .; Retno Indrati
Jurnal Teknologi dan Industri Pangan Vol. 16 No. 3 (2005): Jurnal Teknologi dan Industri Pangan
Publisher : Departemen Ilmu dan Teknologi Pangan, IPB Indonesia bekerjasama dengan PATPI

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Abstract

Xylitol production by Candida shehatae WAY 08 was investigated under two sets of conditions (a) with addition of glucose or arabinose as cosubstrate, (b) ratio of xylose to cosubstrate at the range of 6:1— 6:3%. The fermentation was performed at 3000/n 500 ml Erlenmeyer flasks placed in a shaker incubator at 200 rpm for 72 h. Biornass concentration was calculated as dry mass. Xylose. cosubstrate. xylitol, ethanol, and acetic acid concentrator ware determined using API. C. The result indicated that addition of arabinose as cosubstrate to xylose within the ratio range of 1:6—3:6% could increase xylitol production. The highest xylitol yield (0,84 gIg) and volumetric rate of xylitol production (0.66 g/Lh) were achieved at ratio of xylose to arabinose as high as 6:1%. However, addition of glucose as cosubstrate decreased xylitul production. A medium containing 6% glucose as a sole carbon source could achieve the hiqhest ethanol yield(0.32 g/g) and growth yièld (0,21/ gIg). wh;/e arabinose as a sole source was metabolized mainly for biomoss formation. Key words xylose. cosubstrate. arabinose, glucose. xylitoi. Candida shehatae WAY 08.
Synthesis of Xylitol-Polyester from Palm Fatty Acid Distillate(PFAD) Suhardi .; Tranggono .; Amanda Hardiyani SN
Jurnal Teknologi dan Industri Pangan Vol. 14 No. 1 (2003): Jurnal Teknologi dan Industri Pangan
Publisher : Departemen Ilmu dan Teknologi Pangan, IPB Indonesia bekerjasama dengan PATPI

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Abstract

This study of xylitol-polyester synthesis was carried out using palm fatty acid distillate as the a source fatty acids. The objective of this study was to obtain the optimum condition with regard to reaction kinetis during synthesis. In the experiment, temperatures were varied at 110, 120, 130, 140 and 150oC; while during reactions samples were drawn at 0, 3, 6, 9 and 12 hours for determination of hydroxil value. Results showed that the optimum condition for synthesis was found at 145„b2.5oC for 3.5„b0.5 hours. It was noted, that the reaction was reversible, first order with the activation energy 4475.57 cal/mol for synthesis and 4499.21 cal/mol for hydrolisis.
Co-Authors Amanda Hardiyani SN Indrati, Retno Kapti Rahayu Kuswanto Suhardi . Wisnu Adi Yulianto